Federer and Wawrinka have met nine times in the past and Wawrinka has just the one victory to date.
Roger Federer and Stanislas Wawrinka, Switzerland's top two players, are scheduled to meet in the fourth round of the 2011 French Open on Sunday with a spot in the clay court Slam's quarterfinals on the line.
The match is a rematch from the 2010 Roland Garros draw as the two players met in last year's tournament at the exact same stage. Federer, who normally has little trouble with Wawrinka, won that match in straight sets ahead of losing in the quarters to Robin Soderling of Sweden.
Since that match a year ago, Wawrinka and Federer have met on three more occasions with Federer winning all three matches and only dropping one set.
Overall Federer is 9-1 on head-to-heads against Wawrinka with the only setback coming at Monaco in 2009. While that was a clay court result, Federer is still 2-1 against his countryman on that surface and should have the confidence on Sunday.
Wawrinka is into the fourth round with some momentum as he came back from down two sets to love against Jo-Wilfried Tsonga. However you have to wonder if playing such a lengthy match will only serve to deplete his energy heading into the fourth round and the tougher matches.
Federer should not have any such issues as he has been efficient in Roland Garros so far, having swept through his three matches all in straight sets.
The winner between Federer and Wawrinka will face the winner between David Ferrer and Gael Monfils in Novak Djokovic's section of the draw. By all measures the Swiss Maestro appears to be a heavy favorite heading into the match which is scheduled second for Court Philippe Chatrier on Sunday (stadium start time 11am CET).